.box{
    margin: 0 auto;
    width: 1300px;
    height:600px;
    background-color: #ddd;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    position: relative;
}
.box1{
    width: 300px;
    background-color: #fff;
    border-radius: 15px;
    height: 260px;
}
.box1 .img{
    width: 300px;
    height: 200px;
    border-top-right-radius: 15px;
    border-top-left-radius: 15px;
}